I wouldn’t use a character for this as the whole point here is not walking 
! Consider a Pawn with a Floating Pawn Movement Component and enabled physics instead. It would give you a somewhat reasonable behaviour from the get go:
Again, hard to advise as we don’t know the details, how much realism is needed and what features are a must-have.
If you must use a character for this, then entering ramps could be as easy as:
